If the modem ur talking about is the ZyXEL Prestige 623R-T1 ( that i believe is supplied with iol ), follow the reset sequence below !
10. How to use the Reset button?
Make sure the PWR led is on(not blinking)when you begin this procedure.
Press the RESET button for ten seconds (or until the SYS LED starts blinking), then release it. If the SYS LED blinks, the defaults have been restored and Prestige restart.
Otherwise, go to step 2.
Turn the P623R-A1 off.
While pressing the RESET button, turn the Prestige on.
Continue to hold the RESET button.
The PWR LED will begin to blink and flicker very quickly after about 10 seconds.
This indicates that the defaults have been restored and the P623R-A1 is now restarting.
Hope this helps
( This info and more is available on the ZyXel support page for the Prestige 623R @ http://www.zyxel.com/support/support...a1/index_f.php